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How do you find the center point of rotation?
tracing paper
How do you find the radius of the circle when you know the center and a point on the circle?
measure it
How do we find the center of gravity of a flat irregularly shaped object?
You can use plumb lines to find its center of gravity. Hold it from one point and draw vertical line in direction of gravity (plumb line). Hold it from another point and do the same, and a third point if necessary; where the lines cross is center of gravity
How do you find the center point of a circle?
Draw a cord through the circle (a line through the circle, but not too close to where you imagine the center to be). With construction techniques, find the perpendicular at the center point of the cord, and draw the perpendicular. Do the same thing again starting with a different cord, and the two perpendiculars will intersect at the center of the circle.
If your room is not square how do you find the center of the room?
This will work with any rectangle, but not with some other weird shape: -- Stretch a string on the diagonal, i.e. from one corner to the opposite corner. Tape it down. -- Stretch another string on the other diagonal, i.e. between the two remaining corners. The point where the second string crosses the first string is the center of the floor.
